The national minimum wage increased to £4.50 an hour for 21 year-olds and £3.80 an hour for 18-20 year-olds, on October 1.

These rates will go up to £4.85 and £4.10 respectively from October 1 next year - a rise significantly above the rate of inflation, said Association of Convenience Stores CEO David Rae. “The Low Pay Commission is imposing significant direct costs on convenience stores.”

The ACS is urging members to provide feedback about the impact of the minimum wage on their businesses to help inform talks with the Commission when it reviews rates again next year.

Rae added: “Many of our members support the concept of a minimum wage for all staff, including those under 18. However, the prospect of above inflation increases concerns us.”